Quote:
Originally Posted by Ambush
Always best to start with the easiest and simplest first.
You've eliminated the controls and driveline.
Oil and filter is good.
The next easiest is to acquire the release valves or even just one. If you put in one known good one, then one direction should work, if it is the valves.
Usually on hydrostats, if there is not enough charge oil, the pump will be noisy, at full swash especially.
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It's only noisey while going up a hill. I have to wait a few days but I have access to a good valve off of my buddy's 1650.